U.S. patent application number 17/179415 was filed with the patent office on 2022-06-09 for optical imaging lens.
This patent application is currently assigned to GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD.. The applicant listed for this patent is GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD.. Invention is credited to Run Hu, Ming Yang.
Application Number | 20220179174 17/179415 |
Document ID | / |
Family ID | |
Filed Date | 2022-06-09 |
United States Patent
Application |
20220179174 |
Kind Code |
A1 |
Hu; Run ; et al. |
June 9, 2022 |
OPTICAL IMAGING LENS
Abstract
An optical imaging lens is provided. The optical imaging lens
includes a first lens element, a second lens element, a third lens
element, a fourth lens element, a fifth lens element, a sixth lens
element, a seventh lens element and an eighth lens element
sequentially arranged along an optical axis from an object side to
an image side. Each of the first lens element to the eighth lens
element includes an object-side surface facing the object side and
allowing imaging rays to pass through and an image-side surface
facing the image side and allowing the imaging rays to pass
through. Lens elements of the optical imaging lens are only the
eight lens elements described above, and satisfy the conditions
|V4-V5|.gtoreq.30.000 and (G67+T7)/(G56+T6).gtoreq.1.500.
Inventors: |
Hu; Run; (Xiamen, CN)
; Yang; Ming; (Xiamen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD. |
Xiamen |
|
CN |
|
|
Assignee: |
GENIUS ELECTRONIC OPTICAL (XIAMEN)
CO., LTD.
Xiamen
CN
|
Appl. No.: |
17/179415 |
Filed: |
February 19, 2021 |
International
Class: |
G02B 13/00 20060101
G02B013/00; G02B 9/64 20060101 G02B009/64 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 9, 2020 |
CN |
202011428427.3 |
Claims
1. An optical imaging lens, comprising a first lens element, a
second lens element, a third lens element, a fourth lens element, a
fifth lens element, a sixth lens element, a seventh lens element
and an eighth lens element sequentially arranged along an optical
axis from an object side to an image side, wherein each of the
first lens element to the eighth lens element comprises an
object-side surface facing the object side and allowing imaging
rays to pass through and an image-side surface facing the image
side and allowing the imaging rays to pass through; the second lens
element has negative refracting power; a periphery region of the
image-side surface of the third lens element is concave; an optical
axis region of the object-side surface of the fourth lens element
is concave; and an optical axis region of the image-side surface of
the seventh lens element is convex, wherein lens elements of the
optical imaging lens are only the eight lens elements, and satisfy
conditions as follows: |V4-V5|.gtoreq.30.000; and
(G67+T7)/(G56+T6).gtoreq.1.500, wherein V4 is an Abbe number of the
fourth lens element; V5 is an Abbe number of the fifth lens
element; G67 is an air gap between the sixth lens element and the
seventh lens element on the optical axis; T7 is a thickness of the
seventh lens element on the optical axis; G56 is an air gap between
the fifth lens element and the sixth lens element on the optical
axis; and T6 is a thickness of the sixth lens element on the
optical axis.
2. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
ImgH/BFL.gtoreq.4.200, wherein ImgH is an image height of the
optical imaging lens, and BFL is a distance from the image-side
surface of the eighth lens element to an image plane on the optical
axis.
3. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
(T1+G12)/T2.gtoreq.2.900, wherein T1 is a thickness of the first
lens element on the optical axis; G12 is an air gap between the
first lens element and the second lens element on the optical axis;
and T2 is a thickness of the second lens element on the optical
axis.
4. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
(T2+T3+T6)/(G12+G45).ltoreq.3.600, wherein T2 is a thickness of the
second lens element on the optical axis; T3 is a thickness of the
third lens element on the optical axis; G12 is an air gap between
the first lens element and the second lens element on the optical
axis; and G45 is an air gap between the fourth lens element and the
fifth lens element on the optical axis.
5. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
(T7+G78+T8)/T6.gtoreq.5.000, wherein G78 is an air gap between the
seventh lens element and the eighth lens element on the optical
axis, and T8 is a thickness of the eighth lens element on the
optical axis.
6. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
EFL/AAG.gtoreq.1.500, wherein EFL is an effective focal length of
the optical imaging lens, and AAG is a sum of seven air gaps of the
first lens element to the eighth lens element on the optical
axis.
7. The optical imaging lens according to claim 1, wherein the
optical imaging lens further satisfies a condition as follows:
(T2+T3+T4+T5)/G67.ltoreq.4.000, wherein T2 is a thickness of the
second lens element on the optical axis; T3 is a thickness of the
third lens element on the optical axis; T4 is a thickness of the
fourth lens element on the optical axis; and T5 is a thickness of
the fifth lens element on the optical axis.
8. An optical imaging lens, comprising a first lens element, a
second lens element, a third lens element, a fourth lens element, a
fifth lens element, a sixth lens element, a seventh lens element
and an eighth lens element sequentially arranged along an optical
axis from an object side to an image side, wherein each of the
first lens element to the eighth lens element comprises an
object-side surface facing the object side and allowing imaging
rays to pass through and an image-side surface facing the image
side and allowing the imaging rays to pass through; the second lens
element has negative refracting power; a periphery region of the
image-side surface of the third lens element is concave; an optical
axis region of the object-side surface of the fourth lens element
is concave; the fifth lens element has negative refracting power;
and the sixth lens element has negative refracting power, wherein
lens elements of the optical imaging lens are only the eight lens
elements, and satisfy conditions as follows: |V4-V5|.gtoreq.30.000;
and (G67+T7)/(G56+T6).gtoreq.1.500, wherein V4 is an Abbe number of
the fourth lens element; V5 is an Abbe number of the fifth lens
element; G67 is an air gap between the sixth lens element and the
seventh lens element on the optical axis; T7 is a thickness of the
seventh lens element on the optical axis; G56 is an air gap between
the fifth lens element and the sixth lens element on the optical
axis; and T6 is a thickness of the sixth lens element on the
optical axis.
9. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
(G23+G34+G45)/T3.gtoreq.1.500, wherein G23 is an air gap between
the second lens element and the third lens element on the optical
axis; G34 is an air gap between the third lens element and the
fourth lens element on the optical axis; G45 is an air gap between
the fourth lens element and the fifth lens element on the optical
axis; and T3 is a thickness of the third lens element on the
optical axis.
10. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
ALT/(T7+G78).ltoreq.3.000, wherein ALT is a sum of the thicknesses
of the eight lens elements from the first lens element to the
eighth lens element on the optical axis, and G78 is an air gap
between the seventh lens element and the eighth lens element on the
optical axis.
11. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
TTL/(T1+T7+G78).ltoreq.3.300, wherein TTL is a distance from the
object-side surface of the first lens element to an image plane on
the optical axis; T1 is a thickness of the first lens element on
the optical axis; and G78 is an air gap between the seventh lens
element and the eighth lens element on the optical axis.
12. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
(G45+G56+T6)/T8.ltoreq.2.500, wherein G45 is an air gap between the
fourth lens element and the fifth lens element on the optical axis,
and T8 is a thickness of the eighth lens element on the optical
axis.
13. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
EFL/(T5+G56+T6).gtoreq.5.500, wherein EFL is an effective focal
length of the optical imaging lens, and T5 is a thickness of the
fifth lens element on the optical axis.
14. The optical imaging lens according to claim 8, wherein the
optical imaging lens further satisfies a condition as follows:
TL/(T3+T4+T7).ltoreq.4.500, wherein TL is a distance from the
object-side surface of the first lens element to the image-side
surface of the eighth lens element on the optical axis; T3 is a
thickness of the third lens element on the optical axis; and T4 is
a thickness of the fourth lens element on the optical axis.
15. An optical imaging lens, comprising a first lens element, a
second lens element, a third lens element, a fourth lens element, a
fifth lens element, a sixth lens element, a seventh lens element
and an eighth lens element sequentially arranged along an optical
axis from an object side to an image side, wherein each of the
first lens element to the eighth lens element comprises an
object-side surface facing the object side and allowing imaging
rays to pass through and an image-side surface facing the image
side and allowing the imaging rays to pass through; the second lens
element has negative refracting power; the third lens element has
positive refracting power, and a periphery region of the image-side
surface of the third lens element is concave; and an optical axis
region of the image-side surface of the seventh lens element is
convex, wherein lens elements of the optical imaging lens are only
the eight lens elements, and satisfy conditions as follows:
|V4-V5|.gtoreq.30.000; and (G67+T7)/(G56+T6).gtoreq.1.500, wherein
V4 is an Abbe number of the fourth lens element; V5 is an Abbe
number of the fifth lens element; G67 is an air gap between the
sixth lens element and the seventh lens element on the optical
axis; T7 is a thickness of the seventh lens element on the optical
axis; G56 is an air gap between the fifth lens element and the
sixth lens element on the optical axis; and T6 is a thickness of
the sixth lens element on the optical axis.
16. The optical imaging lens according to claim 15, wherein the
optical imaging lens further satisfies a condition as follows:
(G23+G78)/T4.gtoreq.2.000, wherein G23 is an air gap between the
second lens element and the third lens element on the optical axis;
G78 is an air gap between the seventh lens element and the eighth
lens element on the optical axis; and T4 is a thickness of the
fourth lens element on the optical axis.
17. The optical imaging lens according to claim 15, wherein the
optical imaging lens further satisfies a condition as follows:
T1/(G12+T3).gtoreq.1.600, wherein T1 is a thickness of the first
lens element on the optical axis; G12 is an air gap between the
first lens element and the second lens element on the optical axis;
and T3 is a thickness of the third lens element on the optical
axis.
18. The optical imaging lens according to claim 15, wherein the
optical imaging lens further satisfies a condition as follows:
(T1+T2+T3)/(G12+G78).ltoreq.2.100, wherein T1 is a thickness of the
first lens element on the optical axis; T2 is a thickness of the
second lens element on the optical axis; T3 is a thickness of the
third lens element on the optical axis; G12 is an air gap between
the first lens element and the second lens element on the optical
axis; and G78 is an air gap between the seventh lens element and
the eighth lens element on the optical axis.
19. The optical imaging lens according to claim 15, wherein the
optical imaging lens further satisfies a condition as follows:
EFL/(G23+G45+G67).gtoreq.5.000, wherein EFL is an effective focal
length of the optical imaging lens; G23 is an air gap between the
second lens element and the third lens element on the optical axis;
and G45 is an air gap between the fourth lens element and the fifth
lens element on the optical axis.
20. The optical imaging lens according to claim 15, wherein the
optical imaging lens further satisfies a condition as follows:
(G12+BFL)/T7.ltoreq.2.100, wherein G12 is an air gap between the
first lens element and the second lens element on the optical axis,
and BFL is a distance from the image-side surface of the eighth
lens element to an image plane on the optical axis.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority benefit of China
application serial no. 202011428427.3, filed on Dec. 9, 2020. The
entirety of the above-mentioned patent application is hereby
incorporated by reference herein and made a part of this
specification.
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0002] The invention relates to an optical element, and in
particular to an optical imaging lens.
2. Description of Related Art
[0003] In recent years, optical imaging lenses keep evolving. In
addition to making optical imaging lenses light, thin and compact,
improving the imaging quality of such lenses, such as improving
optical and chromatic aberrations, is also important. To cope with
the demands, the number of optical lens elements may be increased,
but such increase would result in a longer distance from the
object-side surface of a first lens element to an image plane on
the optical axis, which makes it difficult to reduce the thickness
of mobile phones and digital cameras.
[0004] Therefore, efforts have been devoted to provide an optical
imaging lens which is light, thin and compact and has favorable
imaging quality. In addition, a small F-number increases the
luminous flux, and a great image height helps moderately increase
the pixel size which helps night shooting. Thus, a small F-number
and a great image height are gradually becoming the trend on the
market.
SUMMARY OF THE INVENTION
[0005] The invention provides an optical imaging lens capable of
providing a greater image height while reducing the system length
as well as the F-number of the optical imaging lens.
[0006] The invention provides an optical imaging lens, including a
first lens element, a second lens element, a third lens element, a
fourth lens element, a fifth lens element, a sixth lens element, a
seventh lens element and an eighth lens element sequentially
arranged along an optical axis from an object side to an image
side. Each of the first lens element to the eighth lens element
includes an object-side surface facing the object side and allowing
imaging rays to pass through and an image-side surface facing the
image side and allowing the imaging rays to pass through. The
second lens element has negative refracting power. A periphery
region of the image-side surface of the third lens element is
concave. An optical axis region of the object-side surface of the
fourth lens element is concave. An optical axis region of the
image-side surface of the seventh lens element is convex. Lens
elements of the optical imaging lens are only the eight lens
elements described above, and satisfy the following conditions:
|V4-V5|.gtoreq.30.000 and (G67+T7)/(G56+T6).gtoreq.1.500. V4 is an
Abbe number of the fourth lens element; V5 is an Abbe number of the
fifth lens element; G67 is an air gap between the sixth lens
element and the seventh lens element on the optical axis; T7 is a
thickness of the seventh lens element on the optical axis; G56 is
an air gap between the fifth lens element and the sixth lens
element on the optical axis; and T6 is a thickness of the sixth
lens element on the optical axis.
[0007] The invention further provides an optical imaging lens,
including a first lens element, a second lens element, a third lens
element, a fourth lens element, a fifth lens element, a sixth lens
element, a seventh lens element and an eighth lens element
sequentially arranged along an optical axis from an object side to
an image side. Each of the first lens element to the eighth lens
element includes an object-side surface facing the object side and
allowing imaging rays to pass through and an image-side surface
facing the image side and allowing the imaging rays to pass
through. The second lens element has negative refracting power. A
periphery region of the image-side surface of the third lens
element is concave. An optical axis region of the object-side
surface of the fourth lens element is concave. The fifth lens
element has negative refracting power. The sixth lens element has
negative refracting power. Lens elements of the optical imaging
lens are only the eight lens elements described above, and satisfy
the following conditions: |V4-V5|.gtoreq.30.000 and
(G67+T7)/(G56+T6).gtoreq.1.500. V4 is an Abbe number of the fourth
lens element; V5 is an Abbe number of the fifth lens element; G67
is an air gap between the sixth lens element and the seventh lens
element on the optical axis; T7 is a thickness of the seventh lens
element on the optical axis; G56 is an air gap between the fifth
lens element and the sixth lens element on the optical axis; and T6
is a thickness of the sixth lens element on the optical axis.
[0008] The invention further provides an optical imaging lens,
including a first lens element, a second lens element, a third lens
element, a fourth lens element, a fifth lens element, a sixth lens
element, a seventh lens element and an eighth lens element
sequentially arranged along an optical axis from an object side to
an image side. Each of the first lens element to the eighth lens
element includes an object-side surface facing the object side and
allowing imaging rays to pass through and an image-side surface
facing the image side and allowing the imaging rays to pass
through. The second lens element has negative refracting power. The
third lens element has positive refracting power, and a periphery
region of the image-side surface of the third lens element is
concave. An optical axis region of the image-side surface of the
seventh lens element is convex. Lens elements of the optical
imaging lens are only the eight lens elements described above, and
satisfy the following conditions: |V4-V5|.gtoreq.30.000 and
(G67+T7)/(G56+T6).gtoreq.1.500. V4 is an Abbe number of the fourth
lens element; V5 is an Abbe number of the fifth lens element; G67
is an air gap between the sixth lens element and the seventh lens
element on the optical axis; T7 is a thickness of the seventh lens
element on the optical axis; G56 is an air gap between the fifth
lens element and the sixth lens element on the optical axis; and T6
is a thickness of the sixth lens element on the optical axis.
[0009] Based on the above, in the optical imaging lens of the
embodiments of the invention, with the conditions satisfying the
concave-convex surface arrangement design and the refracting power
of the above lens and the design satisfying the above conditions,
the optical imaging lens has a greater image height, and at the
same time, while the system length of the optical imaging lens is
reduced, and the F-number of the optical imaging lens is
decreased.
[0010] To enable the above features and advantages of the invention
to be more comprehensible, the invention is described in detail
below through embodiments with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a schematic diagram illustrating a surface shape
structure of a lens element.
[0012] FIG. 2 is a schematic diagram illustrating a concave-convex
structure and an intersection point of rays of a lens element.
[0013] FIG. 3 is a schematic diagram illustrating a surface shape
structure of a lens element of Example 1.
[0014] FIG. 4 is a schematic diagram illustrating a surface shape
structure of a lens element of Example 2.
[0015] FIG. 5 is a schematic diagram illustrating a surface shape
structure of a lens element of Example 3.
[0016] FIG. 6 is a schematic diagram of an optical imaging lens of
a first embodiment of the invention.
[0017] FIG. 7A to FIG. 7D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
first embodiment.
[0018] FIG. 8 illustrates detailed optical data of an optical
imaging lens of a first embodiment of the invention.
[0019] FIG. 9 illustrates aspheric parameters of an optical imaging
lens of a first embodiment of the invention.
[0020] FIG. 10 is a schematic diagram of an optical imaging lens of
a second embodiment of the invention.
[0021] FIG. 11A to FIG. 11D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
second embodiment.
[0022] FIG. 12 illustrates detailed optical data of an optical
imaging lens of a second embodiment of the invention.
[0023] FIG. 13 illustrates aspheric parameters of an optical
imaging lens of a second embodiment of the invention.
[0024] FIG. 14 is a schematic diagram of an optical imaging lens of
a third embodiment of the invention.
[0025] FIG. 15A to FIG. 15D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
third embodiment.
[0026] FIG. 16 illustrates detailed optical data of an optical
imaging lens of a third embodiment of the invention.
[0027] FIG. 17 illustrates aspheric parameters of an optical
imaging lens of a third embodiment of the invention.
[0028] FIG. 18 is a schematic diagram of an optical imaging lens of
a fourth embodiment of the invention.
[0029] FIG. 19A to FIG. 19D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
fourth embodiment.
[0030] FIG. 20 illustrates detailed optical data of an optical
imaging lens of a fourth embodiment of the invention.
[0031] FIG. 21 illustrates aspheric parameters of an optical
imaging lens of a fourth embodiment of the invention.
[0032] FIG. 22 is a schematic diagram of an optical imaging lens of
a fifth embodiment of the invention.
[0033] FIG. 23A to FIG. 23D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
fifth embodiment.
[0034] FIG. 24 illustrates detailed optical data of an optical
imaging lens of a fifth embodiment of the invention.
[0035] FIG. 25 illustrates aspheric parameters of an optical
imaging lens of a fifth embodiment of the invention.
[0036] FIG. 26 is a schematic diagram of an optical imaging lens of
a sixth embodiment of the invention.
[0037] FIG. 27A to FIG. 27D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
sixth embodiment.
[0038] FIG. 28 illustrates detailed optical data of an optical
imaging lens of a sixth embodiment of the invention.
[0039] FIG. 29 illustrates aspheric parameters of an optical
imaging lens of a sixth embodiment of the invention.
[0040] FIG. 30 is a schematic diagram of an optical imaging lens of
a seventh embodiment of the invention.
[0041] FIG. 31A to FIG. 31D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
seventh embodiment.
[0042] FIG. 32 illustrates detailed optical data of an optical
imaging lens of a seventh embodiment of the invention.
[0043] FIG. 33 illustrates aspheric parameters of an optical
imaging lens of a seventh embodiment of the invention.
[0044] FIG. 34 is a schematic diagram of an optical imaging lens of
an eighth embodiment of the invention.
[0045] FIG. 35A to FIG. 35D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of
an eighth embodiment.
[0046] FIG. 36 illustrates detailed optical data of an optical
imaging lens of an eighth embodiment of the invention.
[0047] FIG. 37 illustrates aspheric parameters of an optical
imaging lens of an eighth embodiment of the invention.
[0048] FIG. 38 is a schematic diagram of an optical imaging lens of
a ninth embodiment of the invention.
[0049] FIG. 39A to FIG. 39D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
ninth embodiment.
[0050] FIG. 40 illustrates detailed optical data of an optical
imaging lens of a ninth embodiment of the invention.
[0051] FIG. 41 illustrates aspheric parameters of an optical
imaging lens of a ninth embodiment of the invention.
[0052] FIG. 42 is a schematic diagram of an optical imaging lens of
a tenth embodiment of the invention.
[0053] FIG. 43A to FIG. 43D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of a
tenth embodiment.
[0054] FIG. 44 illustrates detailed optical data of an optical
imaging lens of a tenth embodiment of the invention.
[0055] FIG. 45 illustrates aspheric parameters of an optical
imaging lens of a tenth embodiment of the invention.
[0056] FIG. 46 is a schematic diagram of an optical imaging lens of
an eleventh embodiment of the invention.
[0057] FIG. 47A to FIG. 47D are diagrams of longitudinal spherical
aberrations and various aberrations of an optical imaging lens of
an eleventh embodiment.
[0058] FIG. 48 illustrates detailed optical data of an optical
imaging lens of an eleventh embodiment of the invention.
[0059] FIG. 49 illustrates aspheric parameters of an optical
imaging lens of an eleventh embodiment of the invention.
[0060] FIG. 50 and FIG. 51 illustrate all important parameters and
numerical values of relational expressions of the optical imaging
lenses of first to sixth embodiments of the invention.
[0061] FIG. 52 and FIG. 53 illustrate all important parameters and
numerical values of relational expressions of the optical imaging
lenses of seventh to eleventh embodiments of the invention.
DESCRIPTION OF THE EMBODIMENTS
[0062] The terms "optical axis region", "periphery region",
"concave", and "convex" used in this specification and claims
should be interpreted based on the definition listed in the
specification by the principle of lexicographer.
[0063] In the present disclosure, the optical system may comprise
at least one lens element to receive imaging rays that are incident
on the optical system over a set of angles ranging from parallel to
an optical axis to a half field of view (HFOV) angle with respect
to the optical axis. The imaging rays pass through the optical
system to produce an image on an image plane. The term "a lens
element having positive refracting power (or negative refracting
power)" means that the paraxial refracting power of the lens
element in Gaussian optics is positive (or negative). The term "an
object-side (or image-side) surface of a lens element" refers to a
specific region of that surface of the lens element at which
imaging rays can pass through that specific region. Imaging rays
include at least two types of rays: a chief ray Lc and a marginal
ray Lm (as shown in FIG. 1). An object-side (or image-side) surface
of a lens element can be characterized as having several regions,
including an optical axis region, a periphery region, and, in some
cases, one or more intermediate regions, as discussed more fully
below.
[0064] FIG. 1 is a radial cross-sectional view of a lens element
100. Two referential points for the surfaces of the lens element
100 can be defined: a central point, and a transition point. The
central point of a surface of a lens element is a point of
intersection of that surface and the optical axis I. As illustrated
in FIG. 1, a first central point CP1 may be present on the
object-side surface 110 of lens element 100 and a second central
point CP2 may be present on the image-side surface 120 of the lens
element 100. The transition point is a point on a surface of a lens
element, at which the line tangent to that point is perpendicular
to the optical axis I. The optical boundary OB of a surface of the
lens element is defined as a point at which the radially outermost
marginal ray Lm passing through the surface of the lens element
intersects the surface of the lens element. All transition points
lie between the optical axis I and the optical boundary OB of the
surface of the lens element. A surface of the lens element 100 may
have no transition point or have at least one transition point. If
multiple transition points are present on a single surface, then
these transition points are sequentially named along the radial
direction of the surface with reference numerals starting from the
first transition point. For example, the first transition point,
e.g., TP1, (closest to the optical axis I), the second transition
point, e.g., TP2, (as shown in FIG. 4), and the Nth transition
point (farthest from the optical axis I).
[0065] When a surface of the lens element has at least one
transition point, the region of the surface of the lens element
from the central point to the first transition point TP1 is defined
as the optical axis region, which includes the central point. The
region located radially outside of the farthest transition point
(the Nth transition point) from the optical axis I to the optical
boundary OB of the surface of the lens element is defined as the
periphery region. In some embodiments, there may be intermediate
regions present between the optical axis region and the periphery
region, with the number of intermediate regions depending on the
number of the transition points. When a surface of the lens element
has no transition point, the optical axis region is defined as a
region of 0%-50% of the distance between the optical axis I and the
optical boundary OB of the surface of the lens element, and the
periphery region is defined as a region of 50%-100% of the distance
between the optical axis I and the optical boundary OB of the
surface of the lens element.
[0066] The shape of a region is convex if a collimated ray being
parallel to the optical axis I and passing through the region is
bent toward the optical axis I such that the ray intersects the
optical axis I on the image side A2 of the lens element. The shape
of a region is concave if the extension line of a collimated ray
being parallel to the optical axis I and passing through the region
intersects the optical axis I on the object side A1 of the lens
element.
[0067] Additionally, referring to FIG. 1, the lens element 100 may
also have a mounting portion 130 extending radially outward from
the optical boundary OB. The mounting portion 130 is typically used
to physically secure the lens element to a corresponding element of
the optical system (not shown). Imaging rays do not reach the
mounting portion 130. The structure and shape of the mounting
portion 130 are only examples to explain the technologies, and
should not be taken as limiting the scope of the present
disclosure. The mounting portion 130 of the lens elements discussed
below may be partially or completely omitted in the following
drawings.
[0068] Referring to FIG. 2, optical axis region Z1 is defined
between central point CP and first transition point TP1. Periphery
region Z2 is defined between TP1 and the optical boundary OB of the
surface of the lens element. Collimated ray 211 intersects the
optical axis I on the image side A2 of lens element 200 after
passing through optical axis region Z1, i.e., the focal point of
collimated ray 211 after passing through optical axis region Z1 is
on the image side A2 of the lens element 200 at point R in FIG. 2.
Accordingly, since the ray itself intersects the optical axis I on
the image side A2 of the lens element 200, optical axis region Z1
is convex. On the contrary, collimated ray 212 diverges after
passing through periphery region Z2. The extension line EL of
collimated ray 212 after passing through periphery region Z2
intersects the optical axis I on the object side A1 of lens element
200, i.e., the focal point of collimated ray 212 after passing
through periphery region Z2 is on the object side A1 at point M in
FIG. 2. Accordingly, since the extension line EL of the ray
intersects the optical axis I on the object side A1 of the lens
element 200, periphery region Z2 is concave. In the lens element
200 illustrated in FIG. 2, the first transition point TP1 is the
border of the optical axis region and the periphery region, i.e.,
TP1 is the point at which the shape changes from convex to
concave.
[0069] Alternatively, there is another way for a person having
ordinary skill in the art to determine whether an optical axis
region is convex or concave by referring to the sign of "Radius of
curvature" (the "R" value), which is the paraxial radius of shape
of a lens surface in the optical axis region. The R value is
commonly used in conventional optical design software such as Zemax
and CodeV. The R value usually appears in the lens data sheet in
the software. For an object-side surface, a positive R value
defines that the optical axis region of the object-side surface is
convex, and a negative R value defines that the optical axis region
of the object-side surface is concave. Conversely, for an
image-side surface, a positive R value defines that the optical
axis region of the image-side surface is concave, and a negative R
value defines that the optical axis region of the image-side
surface is convex. The result found by using this method should be
consistent with the method utilizing intersection of the optical
axis by rays/extension lines mentioned above, which determines
surface shape by referring to whether the focal point of a
collimated ray being parallel to the optical axis I is on the
object-side or the image-side of a lens element. As used herein,
the terms "a shape of a region is convex (concave)," "a region is
convex (concave)," and "a convex- (concave-) region," can be used
alternatively.
[0070] FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining
the shape of lens element regions and the boundaries of regions
under various circumstances, including the optical axis region, the
periphery region, and intermediate regions as set forth in the
present specification.
[0071] FIG. 3 is a radial cross-sectional view of a lens element
300. As illustrated in FIG. 3, only one transition point TP1
appears within the optical boundary OB of the image-side surface
320 of the lens element 300. Optical axis region Z1 and periphery
region Z2 of the image-side surface 320 of lens element 300 are
illustrated. The R value of the image-side surface 320 is positive
(i.e., R>0). Accordingly, the optical axis region Z1 is
concave.
[0072] In general, the shape of each region demarcated by the
transition point will have an opposite shape to the shape of the
adjacent region(s). Accordingly, the transition point will define a
transition in shape, changing from concave to convex at the
transition point or changing from convex to concave. In FIG. 3,
since the shape of the optical axis region Z1 is concave, the shape
of the periphery region Z2 will be convex as the shape changes at
the transition point TP1.
[0073] FIG. 4 is a radial cross-sectional view of a lens element
400. Referring to FIG. 4, a first transition point TP1 and a second
transition point TP2 are present on the object-side surface 410 of
lens element 400. The optical axis region Z1 of the object-side
surface 410 is defined between the optical axis I and the first
transition point TP1. The R value of the object-side surface 410 is
positive (i.e., R>0). Accordingly, the optical axis region Z1 is
convex.
[0074] The periphery region Z2 of the object-side surface 410,
which is also convex, is defined between the second transition
point TP2 and the optical boundary OB of the object-side surface
410 of the lens element 400. Further, intermediate region Z3 of the
object-side surface 410, which is concave, is defined between the
first transition point TP1 and the second transition point TP2.
Referring once again to FIG. 4, the object-side surface 410
includes an optical axis region Z1 located between the optical axis
I and the first transition point TP1, an intermediate region Z3
located between the first transition point TP1 and the second
transition point TP2, and a periphery region Z2 located between the
second transition point TP2 and the optical boundary OB of the
object-side surface 410. Since the shape of the optical axis region
Z1 is designed to be convex, the shape of the intermediate region
Z3 is concave as the shape of the intermediate region Z3 changes at
the first transition point TP1, and the shape of the periphery
region Z2 is convex as the shape of the periphery region Z2 changes
at the second transition point TP2.
[0075] FIG. 5 is a radial cross-sectional view of a lens element
500. Lens element 500 has no transition point on the object-side
surface 510 of the lens element 500. For a surface of a lens
element with no transition point, for example, the object-side
surface 510 the lens element 500, the optical axis region Z1 is
defined as the region of 0%-50% of the distance between the optical
axis I and the optical boundary OB of the surface of the lens
element and the periphery region is defined as the region of
50%-100% of the distance between the optical axis I and the optical
boundary OB of the surface of the lens element. Referring to lens
element 500 illustrated in FIG. 5, the optical axis region Z1 of
the object-side surface 510 is defined between the optical axis I
and 50% of the distance between the optical axis I and the optical
boundary OB. The R value of the object-side surface 510 is positive
(i.e., R>0). Accordingly, the optical axis region Z1 is convex.
For the object-side surface 510 of the lens element 500, because
there is no transition point, the periphery region Z2 of the
object-side surface 510 is also convex. It should be noted that
lens element 500 may have a mounting portion (not shown) extending
radially outward from the periphery region Z2.
[0076] FIG. 6 is a schematic diagram of an optical imaging lens of
a first embodiment of the invention. FIG. 7A to FIG. 7D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the first embodiment.
Referring to FIG. 6 at first, an optical imaging lens 10 of the
first embodiment of the invention includes an aperture 0, a first
lens element 1, a second lens element 2, a third lens element 3, a
fourth lens element 4, a fifth lens element 5, a sixth lens element
6, a seventh lens element 7, an eighth lens element 8 and a filter
9 sequentially arranged along an optical axis I of the optical
imaging lens 10 from an object side A1 to an image side A2. When
rays emitted by an object to be photographed enter the optical
imaging lens 10, and may form an image on an image plane 99 after
passing through the aperture 0, the first lens element 1, the
second lens element 2, the third lens element 3, the fourth lens
element 4, the fifth lens element 5, the sixth lens element 6, the
seventh lens element 7, the eighth lens element 8 and the filter 9.
The filter 9 is arranged between the image-side surface 86 of the
eighth lens element 8 and the image plane 99. It is supplemented
that the object side A1 is a side facing the object to be
photographed, and the image side A2 is a side facing the image
plane 99. In the present embodiment, the filter 9 is an infrared
ray (IR) cut filter.
[0077] In the present embodiment, the first lens element 1, the
second lens element 2, the third lens element 3, the fourth lens
element 4, the fifth lens element 5, the sixth lens element 6, the
seventh lens element 7, the eighth lens element 8 and the filter 9
of the optical imaging lens 10 each has an object-side surface 15,
25, 35, 45, 55, 65, 75, 85, 95 facing the object side A1 and
allowing imaging rays to pass through, and an image-side surface
16, 26, 36, 46, 56, 66, 76, 86, 96 facing the image side A2 and
allowing the imaging rays to pass through. In the present
embodiment, the first lens element 1 is arranged between the
aperture 0 and the second lens element 2.
[0078] The first lens element 1 has positive refracting power. A
material of the first lens element 1 is plastic. An optical axis
region 151 of the object-side surface 15 of the first lens element
1 is convex, and a periphery region 153 thereof is convex. An
optical axis region 161 of the image-side surface 16 of the first
lens element 1 is concave, and a periphery region 163 thereof is
concave. In the present embodiment, both the object-side surface 15
and the image-side surface 16 of the first lens element 1 are
aspheric surfaces, but the invention is not limited thereto.
[0079] The second lens element 2 has negative refracting power. A
material of the second lens element 2 is plastic. An optical axis
region 251 of the object-side surface 25 of the second lens element
2 is convex, and a periphery region 253 thereof is convex. An
optical axis region 261 of the image-side surface 26 of the second
lens element 2 is concave, and a periphery region 263 thereof is
concave. In the present embodiment, both the object-side surface 25
and the image-side surface 26 of the second lens element 2 are
aspheric surfaces, but the invention is not limited thereto.
[0080] The third lens element 3 has positive refracting power. A
material of the third lens element 3 is plastic. An optical axis
region 351 of the object-side surface 35 of the third lens element
3 is convex, and a periphery region 353 thereof is convex. An
optical axis region 361 of the image-side surface 36 of the third
lens element 3 is concave, and a periphery region 363 thereof is
concave. In the present embodiment, both the object-side surface 35
and the image-side surface 36 of the third lens element 3 are
aspheric surfaces, but the invention is not limited thereto.
[0081] The fourth lens element 4 has positive refracting power. A
material of the fourth lens element 4 is plastic. An optical axis
region 451 of the object-side surface 45 of the fourth lens element
4 is concave, and a periphery region 453 thereof is concave. An
optical axis region 461 of the image-side surface 46 of the fourth
lens element 4 is convex, and a periphery region 463 thereof is
convex. In the present embodiment, both the object-side surface 45
and the image-side surface 46 of the fourth lens element 4 are
aspheric surfaces, but the invention is not limited thereto.
[0082] The fifth lens element 5 has negative refracting power. A
material of the fifth lens element 5 is plastic. An optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is convex, and a periphery region 553 thereof is concave. An
optical axis region 561 of the image-side surface 56 of the fifth
lens element 5 is concave, and a periphery region 563 thereof is
convex. In the present embodiment, both the object-side surface 55
and the image-side surface 56 of the fifth lens element 5 are
aspheric surfaces, but the invention is not limited thereto.
[0083] The sixth lens element 6 has negative refracting power. A
material of the sixth lens element 6 is plastic. An optical axis
region 651 of the object-side surface 65 of the sixth lens element
6 is convex, and a periphery region 653 thereof is concave. An
optical axis region 661 of the image-side surface 66 of the sixth
lens element 6 is concave, and a periphery region 663 thereof is
convex. In the present embodiment, both the object-side surface 65
and the image-side surface 66 of the sixth lens element 6 are
aspheric surfaces, but the invention is not limited thereto.
[0084] The seventh lens element 7 has positive refracting power. A
material of the seventh lens element 7 is plastic. An optical axis
region 751 of the object-side surface 75 of the seventh lens
element 7 is convex, and a periphery region 753 thereof is concave.
An optical axis region 761 of the image-side surface 76 of the
seventh lens element 7 is convex, and a periphery region 763
thereof is convex. In the present embodiment, both the object-side
surface 75 and the image-side surface 76 of the seventh lens
element 7 are aspheric surfaces, but the invention is not limited
thereto.
[0085] The eighth lens element 8 has negative refracting power. A
material of the eighth lens element 8 is plastic. An optical axis
region 851 of the object-side surface 85 of the eighth lens element
8 is concave, and a periphery region 853 thereof is concave. An
optical axis region 861 of the image-side surface 86 of the eighth
lens element 8 is concave, and a periphery region 863 thereof is
convex. In the present embodiment, both the object-side surface 85
and the image-side surface 86 of the eighth lens element 8 are
aspheric surfaces, but the invention is not limited thereto.
[0086] In the present embodiment, the lens elements of the optical
imaging lens 10 are only the eight lens elements described
above.
[0087] Other detailed optical data of the first embodiment is as
shown in FIG. 8, and the optical imaging lens 10 of the first
embodiment has an effective focal length (EFL) of 5.842 millimeters
(mm), a half field of view (HFOV) of 40.428.degree., a system
length of 7.559 mm, an F-number (Fno) of 1.650, and an image height
of 5.800 mm. The system length is a distance from the object-side
surface 15 of the first lens element 1 to the image plane 99 on the
optical axis I.
[0088] In addition, in the present embodiment, a total of sixteen
surfaces, including the object-side surfaces 15, 25, 35, 45, 55,
65, 75, 85 and the image-side surfaces 16, 26, 36, 46, 56, 66, 76,
86 of the first lens element 1, the second lens element 2, the
third lens element 3, the fourth lens element 4, the fifth lens
element 5, the sixth lens element 6, the seventh lens element 7 and
the eighth lens element 8, are all aspheric surfaces, and the
object-side surfaces 15, 25, 35, 45, 55, 65, 75, 85 and the
image-side surfaces 16, 26, 36, 46, 56, 66, 76, 86 are common even
asphere surfaces. These aspheric surfaces are defined according to
the following formula (1):
Z .function. ( Y ) = Y 2 R / ( 1 + 1 - ( 1 + K ) .times. Y 2 R 2 )
+ i = 1 n .times. a 2 .times. i .times. Y 2 .times. i
##EQU00001##
where R: a radius of curvature of a position, near the optical axis
I, on a surface of the lens element; Z: a depth of an aspheric
surface (a perpendicular distance between a point, on the aspheric
surface that is spaced by the distance Y from the optical axis and
a tangent plane tangent to a vertex of the aspheric surface on the
optical axis I); Y: a perpendicular distance between a point on an
aspheric curve and the optical axis I; K: a conic constant;
a.sub.2i: a 2i.sup.th-order aspheric coefficient.
[0089] Various aspheric coefficients of the object-side surface 15
of the first lens element 1 to the image-side surface 86 of the
eighth lens element 8 in Formula (1) are as shown in FIG. 9. Column
number 15 in FIG. 9 denotes an aspheric coefficient of the
object-side surface 15 of the first lens element 1, and the rest
columns may be deduced by analogy. In the present embodiment, the
second-order aspheric coefficient a.sub.2 of each aspheric surface
is zero, so they are not listed in FIG. 9.
[0090] In addition, relations among all important parameters in the
optical imaging lens 10 of the first embodiment are as shown in
FIG. 50 and FIG. 51.
f1 is a focal length of the first lens element; f2 is a focal
length of the second lens element; f3 is a focal length of the
third lens element; f4 is a focal length of the fourth lens
element; f5 is a focal length of the fifth lens element; f6 is a
focal length of the sixth lens element; f7 is a focal length of the
seventh lens element; f8 is a focal length of the eighth lens
element; n1 is a refractive index of the first lens element; n2 is
a refractive index of the second lens element; n3 is a refractive
index of the third lens element; n4 is a refractive index of the
fourth lens element; n5 is a refractive index of the fifth lens
element; n6 is a refractive index of the sixth lens element; and n7
is a refractive index of the seventh lens element; n8 is a
refractive index of the eighth lens element; V1 is an Abbe number
of the first lens element; V2 is an Abbe number of the second lens
element; V3 is an Abbe number of the third lens element; V4 is an
Abbe number of the fourth lens element; V5 is an Abbe number of the
fifth lens element; V6 is an Abbe number of the sixth lens element;
V7 is an Abbe number of the seventh lens element; V8 is an Abbe
number of the eighth lens element; T1 is a thickness of the first
lens element on the optical axis; T2 is a thickness of the second
lens element on the optical axis; T3 is a thickness of the third
lens element on the optical axis; T4 is a thickness of the fourth
lens element on the optical axis; T5 is a thickness of the fifth
lens element on the optical axis; T6 is a thickness of the sixth
lens element on the optical axis; T7 is a thickness of the seventh
lens element on the optical axis; T8 is a thickness of the eighth
lens element on the optical axis; G12 is an air gap between the
first lens element and the second lens element on the optical axis;
G23 is an air gap between the second lens element and the third
lens element on the optical axis; G34 is an air gap between the
third lens element and the fourth lens element on the optical axis;
G45 is an air gap between the fourth lens element and the fifth
lens element on the optical axis; G56 is an air gap between the
fifth lens element and the sixth lens element on the optical axis;
G67 is an air gap between the sixth lens element and the seventh
lens element on the optical axis; G78 is an air gap between the
seventh lens element and the eighth lens element on the optical
axis; G8F is an air gap between the eighth lens element and the
filter on the optical axis; TF is a thickness of the filter on the
optical axis; GFP is an air gap between the filter and the image
plane on the optical axis; AAG is a sum of the seven air gaps of
the first lens element to the eighth lens element on the optical
axis; ALT is a sum of the thicknesses of the eight lens elements
from the first lens element to the eighth lens element on the
optical axis; EFL is an effective focal length of the optical
imaging lens; BFL is a distance from the image-side surface of the
eighth lens element to the image plane on the optical axis; TTL is
a distance from the object-side surface of the first lens element
to the image plane on the optical axis; TL is a distance from the
object-side surface of the first lens element to the image-side
surface of the eighth lens element on the optical axis; HFOV is a
half field of view of the optical imaging lens; ImgH is an image
height of the optical imaging lens; and Fno is an F-number of the
optical imaging lens.
[0091] Referring to FIG. 7A to FIG. 7D cooperatively, the diagram
of FIG. 7A illustrates longitudinal spherical aberrations on the
image plane 99 of the first embodiment at wavelengths of 470 nm,
555 nm and 650 nm; the diagrams of FIG. 7B and FIG. 7C respectively
illustrate a field curvature aberration in a sagittal direction and
a field curvature aberration in a tangential direction on the image
plane 99 of the first embodiment at wavelengths of 470 nm, 555 nm
and 650 nm; and the diagram of FIG. 7D illustrates a distortion
aberration on the image plane 99 of the first embodiment at
wavelengths of 470 nm, 555 nm and 650 nm. The longitudinal
spherical aberration of the present first embodiment is as shown in
FIG. 7A. A curve generated by each wavelength is very close, and is
close to the center, which indicates that off-axis rays at
different heights of each wavelength are concentrated near to an
imaging point. It can be seen from the deflection amplitude of the
curve of each wavelength that deflections of the imaging points of
the off-axis rays at different heights are controlled within a
range of .+-.0.06 mm, so that the first embodiment alleviates the
spherical aberration of the same wavelength. In addition, distances
between three representative wavelengths are quite close, it
indicates that imaging positions of different wavelength rays are
quite concentrated, so that the chromatic aberration is also
alleviated.
[0092] In the two field curvature aberration diagrams of FIG. 7B
and FIG. 7C, the focal length variables of three representative
wavelengths within an entire field of view range fall within
.+-.0.12 mm, it indicates that an optical system of the present
first embodiment can effectively eliminate the aberration. The
distortion aberration diagram of FIG. 7D shows that the distortion
aberration of the present embodiment is maintained within a range
of .+-.16%, it indicates that the distortion aberration of the
present first embodiment has met an imaging quality requirement of
the optical system. It is indicated accordingly that compared with
an existing optical lens, the present first embodiment can still
provide good imaging quality in the circumstances that the system
length has been reduced to about 7.559 mm, so the present first
embodiment can reduce the length of the lens and has good imaging
quality under the condition of maintaining good optical
properties.
[0093] FIG. 10 is a schematic diagram of an optical imaging lens of
a second embodiment of the invention. FIG. 11A to FIG. 11D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the second embodiment.
Referring to FIG. 10 at first, the second embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; the optical axis region 561 of the image-side surface
56 of the fifth lens element 5 is convex; the optical axis region
751 of the object-side surface 75 of the seventh lens element 7 is
concave; the periphery region 853 of the object-side surface 85 of
the eighth lens element 8 is convex; and the periphery region 863
of the image-side surface 86 of the eighth lens element 8 is
concave. It should be noted that in order to show the drawing
clearly, numerals of the optical axis regions and the periphery
regions which are similar to the surface shapes in the first
embodiment are partially omitted in FIG. 10.
[0094] Detailed optical data of the optical imaging lens 10 of the
second embodiment are as shown in FIG. 12, and the optical imaging
lens 10 of the second embodiment has an EFL of 7.386 mm, an HFOV of
40.825.degree., a system length of 9.146 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0095] As shown in FIG. 13, FIG. 13 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the second embodiment in the formula (1).
[0096] In addition, relations among all important parameters in the
optical imaging lens 10 of the second embodiment are as shown in
FIG. 50 and FIG. 51.
[0097] A longitudinal spherical aberration of the present second
embodiment is as shown in FIG. 11A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.018 mm. In the two field curvature aberration
diagrams of FIG. 11B and FIG. 11C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.03 mm. The distortion aberration diagram of FIG.
11D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0098] It can be known via the above instructions that: the HFOV of
the second embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the second
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the second
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the second
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the second embodiment
is less than the distortion aberration of the first embodiment.
[0099] FIG. 14 is a schematic diagram of an optical imaging lens of
a third embodiment of the invention. FIG. 15A to FIG. 15D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the third embodiment.
Referring to FIG. 14 at first, the third embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; and the optical axis region 561 of the image-side
surface 56 of the fifth lens element 5 is convex. It should be
noted that in order to show the drawing clearly, numerals of the
optical axis regions and the periphery regions which are similar to
the surface shapes in the first embodiment are partially omitted in
FIG. 14.
[0100] Detailed optical data of the optical imaging lens 10 of the
third embodiment are as shown in FIG. 16, and the optical imaging
lens 10 of the third embodiment has an EFL of 7.256 mm, an HFOV of
41.329.degree., a system length of 9.222 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0101] As shown in FIG. 17, FIG. 17 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the third embodiment in the formula (1).
[0102] In addition, relations among all important parameters in the
optical imaging lens 10 of the third embodiment are as shown in
FIG. 50 and FIG. 51.
[0103] A longitudinal spherical aberration of the present third
embodiment is as shown in FIG. 15A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.016 mm. In the two field curvature aberration
diagrams of FIG. 15B and FIG. 15C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.04 mm. The distortion aberration diagram of FIG.
15D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0104] It can be known via the above instructions that: the HFOV of
the third embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the third
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the third
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the third
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the third embodiment
is less than the distortion aberration of the first embodiment.
[0105] FIG. 18 is a schematic diagram of an optical imaging lens of
a fourth embodiment of the invention. FIG. 19A to FIG. 19D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the fourth embodiment.
Referring to FIG. 18 at first, the fourth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex, and the fourth
lens element 4 has negative refracting power. It should be noted
that in order to show the drawing clearly, numerals of the optical
axis regions and the periphery regions which are similar to the
surface shapes in the first embodiment are partially omitted in
FIG. 18.
[0106] Detailed optical data of the optical imaging lens 10 of the
fourth embodiment are as shown in FIG. 20, and the optical imaging
lens 10 of the fourth embodiment has an EFL of 6.166 mm, an HFOV of
41.857.degree., a system length of 7.849 mm, an Fno of 1.650, and
an image height of 5.800 mm.
[0107] As shown in FIG. 21, FIG. 21 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the fourth embodiment in the formula (1).
[0108] In addition, relations among all important parameters in the
optical imaging lens 10 of the fourth embodiment are as shown in
FIG. 50 and FIG. 51.
[0109] A longitudinal spherical aberration of the present fourth
embodiment is as shown in FIG. 19A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.016 mm. In the two field curvature aberration
diagrams of FIG. 19B and FIG. 19C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.06 mm. The distortion aberration diagram of FIG.
19D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0110] It can be known via the above instructions that: the HFOV of
the fourth embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the fourth
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the fourth
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the fourth
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the fourth embodiment
is less than the distortion aberration of the first embodiment.
[0111] FIG. 22 is a schematic diagram of an optical imaging lens of
a fifth embodiment of the invention. FIG. 23A to FIG. 23D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the fifth embodiment.
Referring to FIG. 22 at first, the fifth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the optical axis region 551 of the object-side
surface 55 of the fifth lens element 5 is concave; the optical axis
region 561 of the image-side surface 56 of the fifth lens element 5
is convex; and the optical axis region 751 of the object-side
surface 75 of the seventh lens element 7 is concave. It should be
noted that in order to show the drawing clearly, numerals of the
optical axis regions and the periphery regions which are similar to
the surface shapes in the first embodiment are partially omitted in
FIG. 22.
[0112] Detailed optical data of the optical imaging lens 10 of the
fifth embodiment are as shown in FIG. 24, and the optical imaging
lens 10 of the fifth embodiment has an EFL of 8.678 mm, an HFOV of
36.326.degree., a system length of 10.203 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0113] As shown in FIG. 25, FIG. 25 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the fifth embodiment in the formula (1).
[0114] In addition, relations among all important parameters in the
optical imaging lens 10 of the fifth embodiment are as shown in
FIG. 50 and FIG. 51.
[0115] A longitudinal spherical aberration of the present fifth
embodiment is as shown in FIG. 23A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.02 mm. In the two field curvature aberration
diagrams of FIG. 23B and FIG. 23C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.04 mm. The distortion aberration diagram of FIG.
23D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0116] It can be known via the above instructions that: the
longitudinal spherical aberration of the fifth embodiment is less
than the longitudinal spherical aberration of the first embodiment;
the field curvature aberration of the fifth embodiment is less than
the field curvature aberration of the first embodiment; and the
distortion aberration of the fifth embodiment is less than the
distortion aberration of the first embodiment.
[0117] FIG. 26 is a schematic diagram of an optical imaging lens of
a sixth embodiment of the invention. FIG. 27A to FIG. 27D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the sixth embodiment.
Referring to FIG. 26 at first, the sixth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; the sixth lens element has positive refracting power;
and the periphery region 853 of the object-side surface 85 of the
eighth lens element 8 is convex. It should be noted that in order
to show the drawing clearly, numerals of the optical axis regions
and the periphery regions which are similar to the surface shapes
in the first embodiment are partially omitted in FIG. 26.
[0118] Detailed optical data of the optical imaging lens 10 of the
sixth embodiment are as shown in FIG. 28, and the optical imaging
lens 10 of the sixth embodiment has an EFL of 7.580 mm, an HFOV of
40.526.degree., a system length of 9.326 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0119] As shown in FIG. 29, FIG. 29 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the sixth embodiment in the formula (1).
[0120] In addition, relations among all important parameters in the
optical imaging lens 10 of the sixth embodiment are as shown in
FIG. 50 and FIG. 51.
[0121] A longitudinal spherical aberration of the present sixth
embodiment is as shown in FIG. 27A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.02 mm. In the two field curvature aberration
diagrams of FIG. 27B and FIG. 27C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.04 mm. The distortion aberration diagram of FIG.
27D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0122] It can be known via the above instructions that: the HFOV of
the sixth embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the sixth
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the sixth
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the sixth
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the sixth embodiment
is less than the distortion aberration of the first embodiment.
[0123] FIG. 30 is a schematic diagram of an optical imaging lens of
a seventh embodiment of the invention. FIG. 31A to FIG. 31D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the seventh embodiment.
Referring to FIG. 30 at first, the seventh embodiment of the
optical imaging lens 10 of the invention is approximately similar
to the first embodiment, except that: various optical data,
aspheric coefficients, and parameters among these lens elements 1,
2, 3, 4, 5, 6, 7 and 8 are different more or less. In addition, in
the present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex; the periphery
region 353 of the object-side surface 35 of the third lens element
3 is concave; the fourth lens element 4 has negative refracting
power; the optical axis region 551 of the object-side surface 55 of
the fifth lens element 5 is concave; the optical axis region 561 of
the image-side surface 56 of the fifth lens element 5 is convex;
the optical axis region 651 of the object-side surface 65 of the
sixth lens element 6 is concave; and the optical axis region 661 of
the image-side surface 66 of the sixth lens element 6 is convex. It
should be noted that in order to show the drawing clearly, numerals
of the optical axis regions and the periphery regions which are
similar to the surface shapes in the first embodiment are partially
omitted in FIG. 30.
[0124] Detailed optical data of the optical imaging lens 10 of the
seventh embodiment are as shown in FIG. 32, and the optical imaging
lens 10 of the seventh embodiment has an EFL of 6.182 mm, an HFOV
of 26.392.degree., a system length of 10.049 mm, an Fno of 1.650,
and an image height of 5.800 mm.
[0125] As shown in FIG. 33, FIG. 33 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the seventh embodiment in the formula (1).
[0126] In addition, relations among all important parameters in the
optical imaging lens 10 of the seventh embodiment are as shown in
FIG. 52 and FIG. 53.
[0127] A longitudinal spherical aberration of the present seventh
embodiment is as shown in FIG. 31A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.9 mm. In the two field curvature aberration
diagrams of FIG. 31B and FIG. 31C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.9 mm. The distortion aberration diagram of FIG.
31D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.90%.
[0128] It can be known from the above instructions that: the
seventh embodiment is easy to fabricate, so that the yield is
relatively high.
[0129] FIG. 34 is a schematic diagram of an optical imaging lens of
an eighth embodiment of the invention. FIG. 35A to FIG. 35D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the eighth embodiment.
Referring to FIG. 34 at first, the eighth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; the optical axis region 561 of the image-side surface
56 of the fifth lens element 5 is convex; and the periphery region
853 of the object-side surface 85 of the eighth lens element 8 is
convex. It should be noted that in order to show the drawing
clearly, numerals of the optical axis regions and the periphery
regions which are similar to the surface shapes in the first
embodiment are partially omitted in FIG. 34.
[0130] Detailed optical data of the optical imaging lens 10 of the
eighth embodiment are as shown in FIG. 36, and the optical imaging
lens 10 of the eighth embodiment has an EFL of 5.913 mm, an HFOV of
47.182.degree., a system length of 7.978 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0131] As shown in FIG. 37, FIG. 37 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the eighth embodiment in the formula (1).
[0132] In addition, relations among all important parameters in the
optical imaging lens 10 of the eighth embodiment are as shown in
FIG. 52 and FIG. 53.
[0133] A longitudinal spherical aberration of the present eighth
embodiment is as shown in FIG. 35A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.03 mm. In the two field curvature aberration
diagrams of FIG. 35B and FIG. 35C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.6 mm. The distortion aberration diagram of FIG.
35D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.6%.
[0134] It can be known via the above instructions that: the system
length of the eighth embodiment is shorter than the system length
of the first embodiment, and the HFOV of the eighth embodiment is
greater than the HFOV of the first embodiment. Therefore, compared
to the first embodiment, the eighth embodiment has a smaller volume
and a larger angle range for receiving images. In addition, the
longitudinal spherical aberration of the eighth embodiment is less
than the longitudinal spherical aberration of the first embodiment,
and the distortion aberration of the eighth embodiment is less than
the distortion aberration of the first embodiment.
[0135] FIG. 38 is a schematic diagram of an optical imaging lens of
a ninth embodiment of the invention. FIG. 39A to FIG. 39D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the ninth embodiment.
Referring to FIG. 38 at first, the ninth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 163 of the image-side
surface 16 of the first lens element 1 is convex, and the fourth
lens element 4 has negative refracting power. It should be noted
that in order to show the drawing clearly, numerals of the optical
axis regions and the periphery regions which are similar to the
surface shapes in the first embodiment are partially omitted in
FIG. 38.
[0136] Detailed optical data of the optical imaging lens 10 of the
ninth embodiment are as shown in FIG. 40, and the optical imaging
lens 10 of the ninth embodiment has an EFL of 6.244 mm, an HFOV of
41.499.degree., a system length of 7.799 mm, an Fno of 1.650, and
an image height of 5.800 mm.
[0137] As shown in FIG. 41, FIG. 41 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the ninth embodiment in the formula (1).
[0138] In addition, relations among all important parameters in the
optical imaging lens 10 of the ninth embodiment are as shown in
FIG. 52 and FIG. 53.
[0139] A longitudinal spherical aberration of the present ninth
embodiment is as shown in FIG. 39A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.018 mm. In the two field curvature aberration
diagrams of FIG. 39B and FIG. 39C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.06 mm. The distortion aberration diagram of FIG.
39D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.5%.
[0140] It can be known via the above instructions that: the HFOV of
the ninth embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the ninth
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the ninth
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the ninth
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the ninth embodiment
is less than the distortion aberration of the first embodiment.
[0141] FIG. 42 is a schematic diagram of an optical imaging lens of
a tenth embodiment of the invention. FIG. 43A to FIG. 43D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the tenth embodiment.
Referring to FIG. 42 at first, the tenth embodiment of the optical
imaging lens 10 of the invention is approximately similar to the
first embodiment, except that: various optical data, aspheric
coefficients, and parameters among these lens elements 1, 2, 3, 4,
5, 6, 7 and 8 are different more or less. In addition, in the
present embodiment, the periphery region 353 of the object-side
surface 35 of the third lens element 3 is concave; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; the optical axis region 561 of the image-side surface
56 of the fifth lens element 5 is convex; and the optical axis
region 751 of the object-side surface 75 of the seventh lens
element 7 is concave. It should be noted that in order to show the
drawing clearly, numerals of the optical axis regions and the
periphery regions which are similar to the surface shapes in the
first embodiment are partially omitted in FIG. 42.
[0142] Detailed optical data of the optical imaging lens 10 of the
tenth embodiment are as shown in FIG. 44, and the optical imaging
lens 10 of the tenth embodiment has an EFL of 6.563 mm, an HFOV of
44.193.degree., a system length of 8.530 mm, an Fno of 1.650, and
an image height of 6.700 mm.
[0143] As shown in FIG. 45, FIG. 45 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the tenth embodiment in the formula (1).
[0144] In addition, relations among all important parameters in the
optical imaging lens 10 of the tenth embodiment are as shown in
FIG. 52 and FIG. 53.
[0145] A longitudinal spherical aberration of the present tenth
embodiment is as shown in FIG. 43A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.018 mm. In the two field curvature aberration
diagrams of FIG. 43B and FIG. 43C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.06 mm. The distortion aberration diagram of FIG.
43D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.5%.
[0146] It can be known via the above instructions that: the HFOV of
the tenth embodiment is greater than the HFOV of the first
embodiment. Therefore, compared to the first embodiment, the tenth
embodiment has a larger angle range for receiving images. In
addition, the longitudinal spherical aberration of the tenth
embodiment is less than the longitudinal spherical aberration of
the first embodiment; the field curvature aberration of the tenth
embodiment is less than the field curvature aberration of the first
embodiment; and the distortion aberration of the tenth embodiment
is less than the distortion aberration of the first embodiment.
[0147] FIG. 46 is a schematic diagram of an optical imaging lens of
an eleventh embodiment of the invention. FIG. 47A to FIG. 47D are
diagrams of longitudinal spherical aberrations and various
aberrations of the optical imaging lens of the eleventh embodiment.
Referring to FIG. 46 at first, the eleventh embodiment of the
optical imaging lens 10 of the invention is approximately similar
to the first embodiment, except that: various optical data,
aspheric coefficients, and parameters among these lens elements 1,
2, 3, 4, 5, 6, 7 and 8 are different more or less. In addition, in
the present embodiment, the periphery region 353 of the object-side
surface 35 of the third lens element 3 is concave; the optical axis
region 551 of the object-side surface 55 of the fifth lens element
5 is concave; the optical axis region 651 of the object-side
surface 65 of the sixth lens element 6 is concave; and the optical
axis region 661 of the image-side surface 66 of the sixth lens
element 6 is convex. It should be noted that in order to show the
drawing clearly, numerals of the optical axis regions and the
periphery regions which are similar to the surface shapes in the
first embodiment are partially omitted in FIG. 46.
[0148] Detailed optical data of the optical imaging lens 10 of the
eleventh embodiment are as shown in FIG. 48, and the optical
imaging lens 10 of the eleventh embodiment has an EFL of 6.032 mm,
an HFOV of 29.748.degree., a system length of 9.209 mm, an Fno of
1.650, and an image height of 5.800 mm.
[0149] As shown in FIG. 49, FIG. 49 illustrates various aspheric
coefficients of the object-side surface 15 of the first lens
element 1 to the image-side surface 86 of the eighth lens element 8
of the eleventh embodiment in the formula (1).
[0150] In addition, relations among all important parameters in the
optical imaging lens 10 of the eleventh embodiment are as shown in
FIG. 52 and FIG. 53.
[0151] A longitudinal spherical aberration of the present eleventh
embodiment is as shown in FIG. 47A, and deflections of imaging
points of off-axis rays at different heights are controlled within
a range of .+-.0.8 mm. In the two field curvature aberration
diagrams of FIG. 47B and FIG. 47C, focal length variables of three
representative wavelengths within an entire field of view range
fall within .+-.0.9 mm. The distortion aberration diagram of FIG.
47D shows that the distortion aberration of the present embodiment
is maintained within a range of .+-.60%.
[0152] It can be known from the above instructions that: the
eleventh embodiment is easy to fabricate, so that the yield is
relatively high.
[0153] Referring to FIG. 50 to FIG. 53 cooperatively, FIG. 50 to
FIG. 53 illustrate tabular diagrams of various optical parameters
of the foregoing first embodiment to eleventh embodiment. With
reference to one of the following combinations (a), (b) and (c),
the optical imaging lens 10 can effectively correct the spherical
aberration and the aberration of an optical system and alleviates
the distortion via the design of the surface shape and the
refracting power, such as the second lens element 2 has negative
refracting power and the periphery region 363 of the image-side
surface 36 of the third lens element 3 is concave.
Where
[0154] (a) the optical axis region 451 of the object-side surface
45 of the fourth lens element 4 is concave, and the optical axis
region 761 of the image-side surface 76 of the seventh lens element
7 is convex; (b) the optical axis region 451 of the object-side
surface 45 of the fourth lens element 4 is concave, the fifth lens
element 5 has negative refracting power, and the sixth lens element
6 has negative refracting power; or (c) the third lens element 3
has positive refracting power and the optical axis region 761 of
the image-side surface 76 of the seventh lens element 7 is
convex.
[0155] In one embodiment, the optical imaging lens 10 satisfies any
of the above combinations. The aberration can be alleviated if the
optical imaging lens also satisfies the following conditions.
The optical imaging lens 10 may satisfy |V4-V5|.gtoreq.30.000, and
the preferable range may be
30.000.ltoreq.|V4-V5|.ltoreq.40.000.
[0156] In another embodiment, the optical imaging lens 10 satisfies
the above conditions. The image height can be increased, the
F-number can be reduced, and the short system length can be
maintained at the same time if the optical imaging lens also
satisfies the following conditions.
The optical imaging lens 10 may satisfy
(G67+T7)/(G56+T6).gtoreq.1.500, and the preferable range may be
1.500.ltoreq.(G67+T7)/(G56+T6).ltoreq.3.600.
[0157] In addition, the optical imaging lens 10 of the embodiments
of the invention satisfies the configurations of the following
materials, so that the chromatic aberration can be alleviated.
Since different materials have different refracting power, the
materials are used with each other to smoothly turn and converge
rays, so as to render favorable imaging quality.
The optical imaging lens 10 may satisfy V2+V3+V4.gtoreq.90.000, and
the preferable range may be 90.000.ltoreq.V2+V3+V4.ltoreq.140.000;
the optical imaging lens 10 may satisfy V3+V4+V6.gtoreq.90.000, and
the preferable range may be 90.000.ltoreq.V3+V4+V6.ltoreq.140.000;
the optical imaging lens 10 may satisfy V5+V6.ltoreq.80.000, and
the preferable range may be 35.000.ltoreq.V5+V6.ltoreq.80.000; or
the optical imaging lens 10 may satisfy V2+V5.ltoreq.80.000, and
the preferable range may be 35.000.ltoreq.V2+V5.ltoreq.80.000.
[0158] In addition, in order to reduce the system length of the
optical imaging lens 10, the air gaps between the lens elements or
the thicknesses of the lens elements may be appropriately adjusted,
but the complexity of fabrication must be considered, and the
imaging quality needs to be guaranteed, so that better
configurations may be achieved if numerical limits of the following
conditions are satisfied.
The optical imaging lens 10 may satisfy ImgH/BFL.gtoreq.4.200, and
the preferable range may be 4.200.ltoreq.ImgH/BFL.ltoreq.9.000; the
optical imaging lens 10 may satisfy (T1+G12)/T2.gtoreq.2.900, and
the preferable range may be 2.900.ltoreq.(T1+G12)/T2.ltoreq.9.300;
the optical imaging lens 10 may satisfy
(T2+T3+T6)/(G12+G45).ltoreq.3.600, and the preferable range may be
1.800.ltoreq.(T2+T3+T6)/(G12+G45).ltoreq.3.600; the optical imaging
lens 10 may satisfy (T7+G78+T8)/T6.gtoreq.5.000, and the preferable
range may be 5.000.ltoreq.(T7+G78+T8)/T6.ltoreq.16.500; the optical
imaging lens 10 may satisfy EFL/AAG.gtoreq.1.500, and the
preferable range may be 1.500.ltoreq.EFL/AAG.ltoreq.2.800; the
optical imaging lens 10 may satisfy (T2+T3+T4+T5)/G67.ltoreq.4.000,
and the preferable range may be
1.000.ltoreq.(T2+T3+T4+T5)/G67.ltoreq.4.000; the optical imaging
lens 10 may satisfy (G23+G34+G45)/T3.gtoreq.1.500, and the
preferable range may be 1.500.ltoreq.(G23+G34+G45)/T3.ltoreq.4.000;
the optical imaging lens 10 may satisfy ALT/(T7+G78).ltoreq.3.000,
and the preferable range may be
1.000.ltoreq.ALT/(T7+G78).ltoreq.3.000; the optical imaging lens 10
may satisfy TTL/(T1+T7+G78).ltoreq.3.300, and the preferable range
may be 2.000.ltoreq.TTL/(T1+T7+G78).ltoreq.3.300; the optical
imaging lens 10 may satisfy (G45+G56+T6)/T8.ltoreq.2.500, and the
preferable range may be 1.000.ltoreq.(G45+G56+T6)/T8.ltoreq.2.500;
the optical imaging lens 10 may satisfy
EFL/(T5+G56+T6).gtoreq.5.500, and the preferable range may be
5.500.ltoreq.EFL/(T5+G56+T6).ltoreq.8.800; the optical imaging lens
10 may satisfy TL/(T3+T4+T7).ltoreq.4.500, and the preferable range
may be 3.000.ltoreq.TL/(T3+T4+T7).ltoreq.4.500; the optical imaging
lens 10 may satisfy (G23+G78)/T4.gtoreq.2.000, and the preferable
range may be 2.000.ltoreq.(G23+G78)/T4.ltoreq.6.300; the optical
imaging lens 10 may satisfy T1/(G12+T3).gtoreq.1.600, and the
preferable range may be 1.600.ltoreq.(T1+G23)/T4.ltoreq.3.000; the
optical imaging lens 10 may satisfy
(T1+T2+T3)/(G12+G78).ltoreq.2.100, and the preferable range may be
0.500.ltoreq.(T1+T2+T3)/(G12+G78).ltoreq.2.100; the optical imaging
lens 10 may satisfy EFL/(G23+G45+G67).gtoreq.5.000, and the
preferable range may be
5.000.ltoreq.EFL/(G23+G45+G67).ltoreq.10.000; and the optical
imaging lens 10 may satisfy (G12+BFL)/T7.ltoreq.2.100, and the
preferable range may be 0.500.ltoreq.(G12+BFL)/T7.ltoreq.2.100.
[0159] In addition, any combination relationships of the parameters
of the embodiments may be additionally selected to add limits to
optical imaging lens, so as to facilitate the optical imaging lens
design of the same architecture of the invention. In view of the
unpredictability of optical system design, under the architecture
of the invention, the optical imaging lens, satisfying the
foregoing conditions, of the invention may have a reduced system
length, an increased image height, favorable imaging quality or
increased assembling yield over the prior art.
[0160] The above-listed exemplary limitation relational expressions
can also be arbitrarily selectively incorporated in unequal numbers
to be applied to the embodiments of the invention, and they are not
limited thereto. During the implementation of the invention, in
addition to the aforementioned relational expressions, detailed
structures, such as the arrangement of concave and convex surfaces,
for a single lens element or broadly for a plurality of lens
elements to enhance the system performance and/or control of the
resolution. It should be noted that these details need to be
selectively incorporated in other embodiments of the invention
without conflicts.
[0161] In conclusion, the optical imaging lens of the embodiments
of the invention can achieve the following.
[0162] I. The longitudinal spherical aberrations, the astigmatic
aberrations and the distortions of all the embodiments of the
invention comply with the usage specification. In addition,
off-axis rays of three representative wavelengths of red, green and
blue at different heights are concentrated near imaging points. It
can be seen according to the deflection amplitude of each curve
that deflections of the imaging points of the off-axis rays at
different heights are all controlled to achieve favorable spherical
aberration, optical aberration and distortion suppression
capacities. Considering the imaging quality data, the distances
among the three representative wavelengths of red, green and blue
are also quite close, which indicates that, according to the
embodiments of the invention, the concentricity of light rays of
different wavelengths and has good chromatic dispersion suppression
capability. Based on the above, with the design and use of the lens
elements with each other, a favorable imaging quality is
achieved.
[0163] II. By designing the surface shape and the refracting power,
such as providing the second lens element 2 with negative
refracting power and making the periphery region 363 of the
image-side surface 36 of the third lens element 3 concave, or in
combination with one of the following, the optical imaging lens of
the embodiments of the invention can effectively correct the
spherical aberration and the optical aberration of the optical
system and reduce the distortion: (a) the optical axis region 451
of the object-side surface 45 of the fourth lens element 4 is
concave and the optical axis region 761 of the image-side surface
76 of the seventh lens element 7 is convex; (b) the optical axis
region 451 of the object-side surface 45 of the fourth lens element
4 is concave, the fifth lens element 5 has negative refracting
power and the sixth lens element 6 has negative refracting power;
or (c) the third lens element 3 has positive refracting power and
the optical axis region 761 of the image-side surface 76 of the
seventh lens element 7 is convex. If any of the above-mentioned
combinations satisfies |V4-V5|.gtoreq.30.000, the chromatic
aberration can be alleviated; and if any of the above-mentioned
combinations satisfies (G67+T7)/(G56+T6).gtoreq.1.500, the image
height can be increased, the F-number can be decreased, and a short
system length of the optical imaging lens can be maintained at the
same time. The preferable range may be
30.000.ltoreq.|V4-V5|.ltoreq.40.000 and
1.500.ltoreq.(G67+T7)/(G56+T6).ltoreq.3.600.
[0164] III. In the optical imaging lens of the embodiments of the
invention, by satisfying the arrangement of the materials, such as:
V2+V3+V4.gtoreq.90.000 or V3+V4+V6.gtoreq.90.000 or
V5+V6.ltoreq.80.000 or V2+V5.ltoreq.80.000, in addition to
alleviating the chromatic aberration, since different materials
have different refracting power, the materials may be used with
each other to smoothly turn and converge the rays, so as to render
favorable imaging quality. The preferable range may be
90.000.ltoreq.V2+V3+V4.ltoreq.140.000,
90.000.ltoreq.V3+V4+V6.ltoreq.140.000,
35.000.ltoreq.V5+V6.ltoreq.80.000,
35.000.ltoreq.V2+V5.ltoreq.80.000.
[0165] IV. An aspheric design is adopted for the lens elements in
all the embodiments of the invention, thereby rendering favorable
imaging quality.
[0166] V. Plastic materials are selected for the lens elements in
the respective embodiments of the invention select plastic
materials, so as to reduce the weight of the optical imaging lens
as well as the cost thereof.
[0167] The contents in the embodiments of the invention include but
are not limited to a focal length, a thickness of a lens element,
an Abbe number, or other optical parameters. For example, in the
embodiments of the invention, an optical parameter A and an optical
parameter B are disclosed, wherein the ranges of the optical
parameters, comparative relation between the optical parameters,
and the range of a condition expression covered by a plurality of
embodiments are specifically explained as follows:
(1) The ranges of the optical parameters are, for example,
.alpha..sub.2.ltoreq.A.ltoreq..alpha..sub.1 or
.beta..sub.2.ltoreq.B.ltoreq..beta..sub.1, where .alpha..sub.1 is a
maximum value of the optical parameter A among the plurality of
embodiments, .alpha..sub.2 is a minimum value of the optical
parameter A among the plurality of embodiments, .beta..sub.1 is a
maximum value of the optical parameter B among the plurality of
embodiments, and .beta..sub.2 is a minimum value of the optical
parameter B among the plurality of embodiments. (2) The comparative
relation between the optical parameters is that A is greater than B
or A is less than B, for example. (3) The range of a condition
expression covered by a plurality of embodiments is in detail a
combination relation or proportional relation obtained by a
possible operation of a plurality of optical parameters in each
same embodiment. The relation is defined as E, and E is, for
example, A+B or A-B or A/B or A*B or (A*B).sup.1/2, and E satisfies
a condition expression E.ltoreq..gamma..sub.1 or
E.gtoreq..gamma..sub.2 or
.gamma..sub.2.ltoreq.E.ltoreq..gamma..sub.1, where each of
.gamma..sub.1 and .gamma..sub.2 is a value obtained by an operation
of the optical parameter A and the optical parameter B in a same
embodiment, .gamma..sub.1 is a maximum value among the plurality of
the embodiments, and .gamma..sub.2 is a minimum value among the
plurality of the embodiments. The ranges of the aforementioned
optical parameters, the aforementioned comparative relations
between the optical parameters, and a maximum value, a minimum
value, and the numerical range between the maximum value and the
minimum value of the aforementioned conditions expression are all
implementable and all belong to the scope disclosed by the
invention. The aforementioned description is for exemplary
explanation, but the invention is not limited thereto.
[0168] The embodiments of the invention are all implementable. In
addition, a combination of partial features in a same embodiment
can be selected, and the combination of partial features can
achieve the unexpected result of the invention with respect to the
prior art. The combination of partial features includes but is not
limited to the surface shape of a lens element, a refracting power,
a condition expression or the like, or a combination thereof. The
description of the embodiments is for explaining the specific
embodiments of the principles of the invention, but the invention
is not limited thereto. Specifically, the embodiments and the
drawings are for exemplifying, but the invention is not limited
thereto.
* * * * *